VEHICLE STABILITY WHILE DRIVING ON AUTOMATIC DRIVING /LANE KEEPING SYSTEM FAILED 3 TIMES ALMOST CAUSING VEHICLE TO LOOSE CONTROL AND CRASH. ON 4 OTHER OCCASIONS THE VEHICLES LANE KEEPING FAILED TO KEEP BETWEEN LANES AND INSTEAD VEAR VEHICLE IN DIFFERENT STEERING DIRECTIONS, FORCING ME TO PULL AGAINST THE STEARING WHEEL TO GO BACK STRAIGHT. AUDI AMERICA AND LOCAL DEALER CONTINUE TO SAY EVERYTHING IS OK BUT ON ALL THREE OCCASIONS I HAD WITNESSES IN MY CAR.